package main

import "fmt"

func main() {
	var a int
    fmt.Println("Hello, World!")
	fmt.Println("a = ",a)
	a = 10
	fmt.Println("a = ",a)
	
	var b = "hello"
	fmt.Println("b = ",b)
	
	var c int = 110
	fmt.Println("c = ",c)
	fmt.Printf("d type is %T", c)
	
	d := "ZiDongTuiDao"
	fmt.Println("d = ",d)
	fmt.Printf("d type is %T", d)
}